MFMessageComposeViewController *picker = [[MFMessageComposeViewController alloc] init];
picker.messageComposeDelegate = self;
picker.recipients = [NSArray arrayWithObjects:@"1234", @"2345", nil];
picker.body = yourTextField.text

[self presentModalViewController:picker animated:YES];
[picker release];

#import <UIKit/UIKit.h>
#import <MessageUI/MessageUI.h>

@interface YourClass : UIViewController <MFMessageComposeViewControllerDelegate>
{
    // ...

NSString *sms = @"sms:+1234567890&body=This is sms body.";
NSString *url = [sms stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]];

static func sendMessageToNumber(number:String,message:String){

        let sms = "sms:(number)&body=(message)"
        let url = URL(string:sms)!
        let shared = UIApplication.shared

        if(shared.canOpenURL(url)){
            shared.openURL(url)
        }else{
            print("unable to send message")
        }
    }